As you see, at the joints of two objects, a different shade of color is drawn, although the material of the objects is the same, maybe someone knows how to fix it?
I’m still not sure what is separate and what is not but…
…one side you have directional light hitting the surface: no problem; the other side is the indirect light…
Maybe it’s just shading differences because of the way is light calculated in Unreal /by object/…
Have you tried decreasing indirect lighting smoothness (0.6) under lightmass settings? /you might also need to decrease scale too 0.15/